19649453161 has 32 divisors (see below), whose sum is σ = 22123221120. Its totient is φ = 17334342144.

The previous prime is 19649453129. The next prime is 19649453189. The reversal of 19649453161 is 16135494691.

It is a cyclic number.

It is not a de Polignac number, because 19649453161 - 2⁵ = 19649453129 is a prime.

It is a super-2 number, since 2×19649453161² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19649453101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7683295 + ... + 7685851.

It is an arithmetic number, because the mean of its divisors is an integer number (691350660).

Almost surely, 2^19649453161 is an apocalyptic number.

It is an amenable number.

19649453161 is a deficient number, since it is larger than the sum of its proper divisors (2473767959).

19649453161 is a wasteful number, since it uses less digits than its factorization.

19649453161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2905.

The product of its digits is 699840, while the sum is 49.

The spelling of 19649453161 in words is "nineteen billion, six hundred forty-nine million, four hundred fifty-three thousand, one hundred sixty-one".